Kaye claimed Coalition and Labor governments had generated ''substantial, and in many cases proven, allegations of corruption and influence peddling'' when dealing with industries that could benefit from their decisions.

Last year, unions successfully challenged in the High Court the government's ban on corporations and associations donating to political parties. The court ruled the ban and related spending rules curbed freedom of political expression.

Kaye said his proposal was more likely to survive a challenge because it targeted ''integrity-risk'' companies that could gain substantially from government decisions.

The move by the Greens follows the announcement of corruption inquiries into former energy minister Chris Hartcher and two other central coast MPs.

NSW Minerals Council chief executive Stephen Galilee said the proposal was an ''attack on the democratic right of 50,000 NSW mining workers and their families to support political candidates of their choice''.

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